<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02_变量与常量</title>
</head>
<body>
<script>
     var a = 1;
     console.log(a);
     var b = 3.14;
     console.log(b);
     var c = "hello";
     console.log(c);
     var d = true;
     console.log(d);
     a=5.5;
     console.log(a);
     var a="manba";
     console.log(a);

     let x=11;
     console.log(x);
      x=5.55;
     console.log(x);
/*     let x="胡椒粉";
     console.log(x);*/

     const y=1515;
     console.log(y);
     /*y=676;*/

</script>
</body>
</html>